Experienced businessmen know how to pull off advertising which will
work on a continuous basis but that, indeed, takes experience - lots of
trial and error work and no control over - money and time wasted when
every cent invested in growing the business is supposed to bring profit
back as that is the whole concept of marketing and all its' methods
developed as a business expansion science.
Marketing does bring many new customers in as well as old customers
back when products are marketed in a way so your campaigns strictly
stick to your marketing plan which is powered by the preceding
research.
Be wise and prosper.